启动MyEclipse，弹出一个框，报错。

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Errors occurred during the build.

Errors running builder 'DeploymentBuilder' on project 'SeNT-DL'.

java.lang.NullPointerException

Server view报错：

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Could not create the view: An unexpected exception was thrown.

Server view报错：

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java.lang.NullPointerException

at com.genuitec.eclipse.ast.deploy.core.Deployment.<init>(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.ModuleDeployment.<init>(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.WebDeployment.<init>(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.Deployment.create(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.loadFromPreferences(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.init(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.<init>(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.DeploymentManager.getDefault(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.ui.ServerTreeViewer$ServerTreeContentProvider.inputChanged(Unknown Source)

at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:276)

at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1690)

at com.genuitec.eclipse.ast.deploy.core.ui.ServerTreeViewer.<init>(Unknown Source)

at com.genuitec.eclipse.ast.deploy.core.ui.ServerView.createPartControl(Unknown Source)

at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:375)

at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:229)

at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)

at org.eclipse.ui.internal.Perspective.showFastView(Perspective.java:2171)

at org.eclipse.ui.internal.Perspective.setActiveFastView(Perspective.java:1939)

at org.eclipse.ui.internal.Perspective.setActiveFastView(Perspective.java:1952)

at org.eclipse.ui.internal.Perspective.toggleFastView(Perspective.java:2367)

at org.eclipse.ui.internal.WorkbenchPage.toggleFastView(WorkbenchPage.java:3972)

at org.eclipse.ui.internal.ShowFastViewContribution.showView(ShowFastViewContribution.java:157)

at org.eclipse.ui.internal.ShowFastViewContribution.access$1(ShowFastViewContribution.java:155)

at org.eclipse.ui.internal.ShowFastViewContribution$3.widgetSelected(ShowFastViewContribution.java:138)

at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)

at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)

at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)

at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)

at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)

at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)

at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)

at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)

at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)

at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)

at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)

at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)

at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)

at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

Server视图显示的是项目部署在Server的情况，每个工作空间都有个性化配置。找到工作空间的Server项目部署配置文件。

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目录是$工作空间\.metadata\.plugins\org.eclipse.core.runtime\.settings\com.genuitec.eclipse.ast.deploy.core.prefs

根据工作空间的Server项目部署配置文件可以看出，Server部署了两个项目，分别是SeNT-DL，SeNT-b11M

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eclipse.preferences.version=1

tomcat7Server.SeNT-DL.IEARProjectName=

tomcat7Server.SeNT-DL.altContextRoot=

tomcat7Server.SeNT-DL.contextRoot=/SeNT-DL

tomcat7Server.SeNT-DL.deployIsOverProject=false

tomcat7Server.SeNT-DL.deploymentPath=F\:\\apache-tomcat-7.0.55\\webapps\\SeNT-DL

tomcat7Server.SeNT-DL.isDeployed=true

tomcat7Server.SeNT-DL.isExploded=true

tomcat7Server.SeNT-DL.isUptoDate=true

tomcat7Server.SeNT-DL.noFileCopy=false

tomcat7Server.SeNT-DL.shouldBackup=false

tomcat7Server.SeNT-DL.shouldOverwrite=false

tomcat7Server.SeNT-DL.type=WebDeployment

tomcat7Server.SeNT-b11M.IEARProjectName=

tomcat7Server.SeNT-b11M.altContextRoot=

tomcat7Server.SeNT-b11M.contextRoot=/SeNT-b11M

tomcat7Server.SeNT-b11M.deployIsOverProject=false

tomcat7Server.SeNT-b11M.deploymentPath=F\:\\apache-tomcat-7.0.55\\webapps\\SeNT-b11M

tomcat7Server.SeNT-b11M.isDeployed=true

tomcat7Server.SeNT-b11M.isExploded=true

tomcat7Server.SeNT-b11M.isUptoDate=true

tomcat7Server.SeNT-b11M.noFileCopy=false

tomcat7Server.SeNT-b11M.shouldBackup=false

tomcat7Server.SeNT-b11M.shouldOverwrite=false

tomcat7Server.SeNT-b11M.type=WebDeployment

 

实际上，Server只部署了一个项目SeNT-DL，另外一个项目SeNT-b11M被删除了。

另外一个项目SeNT-b11M被删除了，删除的方式是进入tomcat的webapps，直接删除。没有通知MyEclipse，导致MyEclipse的工作空间的Server项目部署配置文件没有做更新，依旧配置Server部署了两个项目，分别是SeNT-DL，SeNT-b11M。

解决方法一：更新MyEclipse的工作空间的Server项目部署配置文件com.genuitec.eclipse.ast.deploy.core.prefs，根据实际情况，删除已经不存在于Server的项目配置。把以下高亮部分配置删除。

解决方法二：删除tomcat的webapps的所有项目，删除文件com.genuitec.eclipse.ast.deploy.core.prefs。这种方式相当于清空部署在tomcat的所有项目，清空MyEclipse的工作空间的Server项目部署配置文件。(本人使用的就是这一种方法 ，直接删除)

为了避免此类问题再次出现，想要删除部署在tomcat的项目时，不要进入tomcat的webapps，直接删除，而是在server view视图做删除。在server view视图做删除项目时，MyEclipse会更新工作空间的Server项目部署配置文件。